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Reconstructed images in numerical simulation[28]. The 1st –3rd rows are the global gray-scale reconstructions by SIR-TV, the spectral interior reconstructions by the proposed method and the spectral CT results based on FBP reconstructions (with appropriate extrapolation and constant shift), respectively. From 1st to 4th columns are the results from the projections assuming 105, 5×104, 2×104, and 104 photons, respectively
